Hi there. Here is the link you need. I have been using GSYNCIT as an add-on to Outlook to upload tasks etc to Toodledo then using APPIGO TODO on iphone 4 to download/sync them. It works great. Of course some money is involved, but,,, these are well worth it.
Gordonhttp://www.fieldstonsoftware.com/software/gsyncit3/index.shtml